lectricpharaoh

I have no clue how to develop something like this, and I expect if you're not quite comfortable with systems programming, it might well be beyond your current skills. However, one thing you could do is see if you can find some open source or public domain VPN software. As emulating a network is a big part of things for VPN, you can very probably derive some useful information.

Likewise, forums or newsgroups dedicated to such projects can probably be helpful. Just remember to search before asking, so you don't annoy the folks there.

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And once again, Probability proves itself willing to sneak into a back alley and service Drama as would a copper-piece harlot.
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